[w3c/payment-request] chore: Prepare PR branch (#860)

Prepares for Proposed Recommendation. Date values subject to change.  
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/860

-- Commit Summary --

  * chore: Prepare PR branch

-- File Changes --

    M index.html (9)

-- Patch Links --

https://github.com/w3c/payment-request/pull/860.patch
https://github.com/w3c/payment-request/pull/860.diff

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